Sectional water-tube boiler.



P. F. DUNDON. SEGTIQNAL WATER TUBE BOILER.

APPLICATION FILED JULY 3.1911.

4 SHEETS-SHEET 1.

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AFN-NATION FILED JULY 3. 1911.

Patented Apr. 8, 1918.

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T P. DUNDON. SECTIONAL WATER TUBE BOILER.

Patented Apr. 8, 1913.

4 SEEMS-SEEM. s.

APPLIGATION FILED JULY 3 P. FQDUNDON SEG'IIONAL WATER TUBE BOILER.

APBLIUATIOH TILED JULY 3, 1911.

Patented Apr. 8, 1913v 4 SHEET8SHEET 4:

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PATRICK 5. ETUNDOII, OF SAN FRANCISCO, iiALIFORNIA SEQTIONAL WATER-TUBEBGILER.

To all whom it may concern.

Be it known that I, PATRICK F. DUNnoN, a citizen of the United States,residing at San Francisco, in county of San Francisco and State ofCalifornia, have invented certain new and useful Improvements inSectional VVater-Tube Boilers, of -which the following is aspecification.

My invention relates to an improvement in sectional water-tube boilers.

The object is to provide an improved circulating system by constructingthe boiler on scientific lines and principles; to provide a boiler ofsimplified construction with a 'maxin'iuin of heating and eneratingsurfaces Within a given space, novel in arrangement and convenient toset up or dismantle; and to malreprovisions for free and easy access tothe various parts from the exterior, for cleaning or other purposes.

Nith these and other objects in view, this invention consists in certainnovel features of construction and combinations of parts which will behereinafter fully described and pointed out in the claims.

In the accompanying drawings :Figure l is a view in frontelevation withhalf of the front plate removed, and the interior parts transverselysectioned to show the internal construction, Figs. 2 and 3 are views ofo posite ends of my improved Watertube oiler in longitudinal section,parts of the interior being shown in elevation, and others in section,the two views being continuations of each other with the center portionbroken out, Fig. 4 is an enlarged detail in longitudinal verticalsection through one of the end circulating chambers showing the ends ofthe tubes connected therewith, Fig. 5 is an end view of one of thesechambers, and Fig. 6 is an enlarged transverse section through two ofthe inner and outer tubes.

As in my Letters Patent No. 611,407, granted Sept. 2?, l8l8, rny presentinvention is in the main made up of series of units composed each ofclusters of preferably seven outer and seven inner tubes 1,,1, and

2, 2, respectively, they being maintained in.

this concentric arrangement by centeringpins 3, secured to theinnertubes 2, 2, and titted-to the bores of the outer. tubes l, l', asshown in enlarged section in Fig. 6. The purpose of these inner tubes isto break the solidity of the "water currents of the main orSpecification of Letters Patent.

application filed July 3, 1811.

Iatented Apr. 1913. Serial be. 636,677.

outer tubes, which is accomplished by creating an annular body of waterbetween the inner and outer tubes and a smaller bod of water againwithin the inner tube; and by providing the. annular body of water whichis contained between the two' surfaces of these tubes and which isexposed to the high. degree of surface of the water tubes, the smallbody of heat which is applied to the outer water contained between thetwo tubes is rapidly heated, and in that way a lively circulation of thewater is the settlement and adhesion-of sediment on the exposedsurfaces, and it also equalizes produced within the boiler which ishighly essential in a boiler of this particular class for it prevents.

the temperature throughout the boiler and causes more rapid evaporation..By the inner tubes' removable as shown, they may be drawn out when theboilers are opened up to permit examinationorscaling of the inside ofthe main tubes; These clusters of concentrically-arranged tubes aredisposed dia onally, as shown in Figs. 2, 3,

making and a, they eing secured at their ends in v thecirculatingchambers 4, 42, in whichthe ends of the outer tubes are set andexpanded,

as shown in Fig. 4. These circulating chain:

bers i, L, are mounted one on. top of another, in four vertical rows, atfront and rear ends of the boiler in the particular constructionillustrated, they being connected by thiinbles 5, 5, expanded at theirends as shown in Figs. 1, 2, and 3. These circulating chambers aresupported and similarly connected with, the two drums 6 and 7 at thebottom, the latter constituting a mud-drum, being located at thelowermost point in the furnace; and Sui-mounting these vertical rows ofcirculating chambers are the two drums 8 and 9, the latter being oflarge size and constituting the main steam drum.

At the forward end of the'furnace, the circulating drums 6 and 8, andthe intermediate circulating chambers are referably supported on thestands or sadd cs 10, 16,.

Circulating tubes 13, 13, extend between the lower circulating drum andmuddrum, their ends being preferably held in place by steel flanges let,l4;, riveted on the drums into which the ends of the tubes are set andexpanded; and from the upper front circulating drum 8 to the steam drum,a number otsteam circulating pipes 15, 15, extend, they being similarlyconnected by means of steelfianges 16, 1G, to their respective drums.

Hand holes 17, 17, are provided at various points, notably in the drumsand circulating chambers at points opposite to or in line with thetubes, as illustrated in Figs. 2, 3, and 4-. The edges ofthese'hand-holes or man-holes extend upwardly in the form of a flange17. These hand holes are closed by gasketed plates 18, which preferablyhave handles 19, 19, for convenience in the manipulation of same; andthese hand-hole plates or covers are held securely in place by means ofbolts 20, 20, the heads of which are slidably secured in the grooves 21on the plates, and the spanner bars 22, 22, by turning the nuts 23, 23,securely on the bolts. Doors 24. and 25 on the front plate of. theboiler and at other points, if desired, aiiford a means of access tothese hand-holes. Through these man-holes or hand-holes, the tubes maybe removed and replaced, or the tubes cleaned out, or inspected.

The grate 26 is located at the forward end with the usual doors 27 and28 for the tire and ash pit respectively, and the products of combustionare directed circuitously by the baffles 29, 29, made of refractorymaterial alternately arranged, as shown in Figs. 2

and 3; and by this means, the heat will be absorbed from the gasesbefore they are allowed to escape through the chimney.

As shown in Fig. 1. open spaces 30, 30, are provided between thehorizontal clusters of tubes, they being covered by means of removableplates 31, 31., and through these open spaces, either steam or air underpressure may be used to blow 0E soot or ashes from the tubes'andbattles.

The parts described may be incased in any approved manner by stiff sheetsteel or any other material. The outlet to the chimney fine may bedirected under the steam drum, as illustrated in Fig. 3, or it might bebrought up on the front side of the drum, if desired, although thedrawings do not show this From the foregoing description, it will beseen that with the circulating drums 6 and 8 in front of the furnace,the steam drum and the mud-drum at the top and bottom of the rear of thefurnace respectively, (when connected by all the tubes as shown anddescribed), a clear and unobstructed circulation is obtained in everydirection.

I-laving fully described my invention,

what I claim as new and desire to secure by Letters Patent, is

1. In a steam boiler, circulating chambers, and clusters of concentrictubes connected to and communicating with the circulating chambers attheir opposite ends.

2. In a steam-boiler, circulating chambers, tubes connected at theirends to said therewith, and having centering devices for maintainingtheir position within the outer tubes, said interior tubes opening intothe circulating chambers.

3. In a steamboiler, transversely-disposed circulatin drums arranged atthe top and bottom 0' one end of the boiler, a steam drum and a mud-drumcorrespondingly arranged at the other end or. the boiler, circulatingchambers located vertically between said upper and lower drums and incom- -munication therewith, and circulating pipes extending lengthwiseof the furnace from the steam and muddrums to the drums at the oppositeends of the furnace.

i. In a steam-boiler, transversely-disposed circulating drums arrangedat the top and bottom of one end of the boiler, a steam ranged at theother end of the'boiier, circulating chambers located vertically betweensaid upper and lower drums and in communication therewith, circulatingpipes extending lengthwise oi the furnace from the steam and mud-drumsto the drums at the opposite ends of the furnace, and clusters of tubesextending from the circuia ing chambers at one end of the furnace tothose at the opposite end.

5. In a steam-boiler, transverselydisposed circulating drums arranged atthe top and bottom of one end or" the boiler, a steam drum and amud-drum correspondingly arranged at the other end 01 the boiler,circulating chambers located vertically between said upper and lowerdrums in communication therewith, circulating pipes extending lengthwiseoft the furnace from the steam and. mud-drums to the drums at theopposite ends of the furnace, and clusters of concentric tubes extendingfrom the circuthose at the opposite end.

6. 111 a steam-boiler,transversery-disposed circulating drums arrangedat the top and bottom or one end of the boiler, a steam drum and amud-drum correspondingly arranged at the other end. of the boiior, circulating chambers, located vertically between said upper and lower drums,circulating pipes extending lengthwise of the furnace from the steam andmud-drums to the drums at the opposite ends of the furnace, and cluchambers at one end of the furnace to those atthe opposite end, andbaffies extending chambers, and internal tubes concentric drum and amud-drum correspondingly arters of tubes extending fromthe circulatinglating chambers at one end of the furnace to vertical stacks betweensaid drums and in communication therewith, said chambers communicatingwith one another, and their communicating passages in alinement.

8. In asteam-boiler, transversely-disposed drums, circulating chambersinterposed in vertical stacks between said drums and in communicationtherewith, concentric tubes connecting and communicating with saidcirculating chambers, said chambers having unobstructed interiors, andtheir communicating passages in alinement, and circulating pipesconnecting the oppositely-located front and rear drums.

9. Ina steamboiler, transversely-disposed drums, circulating chambersinterposed in vertical stacks between said drums and in communicationtherewith, concentric tubes connecting and communicating with saidcirculating chambers, said chambers having unobstructed interiors, andtheir communicating passages in alinement:

In testimony whereof I afiix my signature, in the presence of twowitnesses.

PATRICK Ft DUNDON.

Witnesses:

CHARLES EDELMAN, J. A. BYRNES.

